18219008 has 36 divisors (see below), whose sum is σ = 36700020. Its totient is φ = 9043968.

The previous prime is 18219001. The next prime is 18219017. The reversal of 18219008 is 80091281.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18219001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131003 + ... + 131141.

It is an arithmetic number, because the mean of its divisors is an integer number (1019445).

Almost surely, 2^18219008 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18219008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18350010).

18219008 is an abundant number, since it is smaller than the sum of its proper divisors (18481012).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18219008 is an frugal number, since it uses more digits than its factorization.

18219008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173 (or 141 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 18219008 is about 4268.3729921365. The cubic root of 18219008 is about 263.1327525959.

The spelling of 18219008 in words is "eighteen million, two hundred nineteen thousand, eight".